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Publication numberUS4313991 A
Publication typeGrant
Application numberUS 06/136,170
Publication dateFeb 2, 1982
Filing dateMar 31, 1980
Priority dateMar 31, 1980
Publication number06136170, 136170, US 4313991 A, US 4313991A, US-A-4313991, US4313991 A, US4313991A
InventorsThomas R. Lamb
Original AssigneeLamb Thomas R
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Seam-covering device
US 4313991 A
A plasterboard seam taping strip having a body formed of planar plastic material with tapered side edges. The rear of the body strip has self-adhesive material applied thereto. On the face of the body strip, extending lengthwise in the middle thereof is a central projection. In alternate embodiments the central projection may be elongated in width and have a notch defined therein. The seam-taping member of this invention may be applied to seams on walls and also on inside and outside corners.
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I claim:
1. An improved plasterboard seam taping member for use at junctions between adjoining pieces of plasterboard where the plasterboard edges are slightly tapered comprising:
a body strip formed of planar plastic material having a front face, a rear face, and parallel side edges which have a taper toward said rear face;
adhesive means affixed to the rear of said body strip material to adhere said body strip to said plasterboard over the seams formed therebetween; and
a narrow projection approximately 1/8 inch in height in the form of a bead having a top extending longitudinally parallel to said side edges upon the central portion of the front face of said strip, the top of said projection, when said body strip is adhered to the slightly tapered plasterboard edges at a junction between two sheets of plasterboard, being higher than said body strip elevating the trowel applying plaster to the joint and causing a feathering of the plaster outward from said projection to beyond the side edges of said body strip.
2. The structure of claim 1 wherein said central projection is widened and has defined therein a notch in its face, said strip being adapted to cover not only seams on planar surfaces but also to be bent for use on inside and outside corner seams and is adapted for portions of the widened central projection, once said strip is installed to be on each side of said corner, to elevate said trowel to cause a feathering of the plaster beyond said body strip.
3. The structure of claim 1 wherein said central projection is widened and has defined in the rear face of said strip a notch adapted to assist in the bending of said strip in either direction for application to either an inside or outside corner seam and is adapted for portions of the widened central projection, once said strip is installed to be on each side of said corner, to elevate said trowel to cause a feathering of the plaster beyond said body strip.
4. The structure of claim 2 wherein the sides of said notch are at 90 to one another.
5. The structure of claim 1 wherein said strip has a plurality of apertures defined therein.
6. The structure of claim 1 wherein said strip has a plurality of longitudinal grooves defined therein.
7. The structure of claim 1 wherein said strip has a plurality of horizontal grooves defined therein.

1. Field of the Invention

The device of this invention is utilized for covering seams between plasterboard members to form, when covered by plaster, an invisible joint therebetween.

2. History of the Prior Art

At present in plasterboard construction where plasterboard sheets meet, the seams are often covered with a paper tape approximately 3 inches in width which is plastered over so as to become invisible under the final painting or papering of the wall. Corner seams, both inside and outside, have most recently been finished using metal stripping in special shapes, one of which forms the inside corner and another which forms the outside corner.


It is an object of this invention to provide a plastic material for seam covering which can be easily applied, be provided in rolls of any length, and which can alternately be used for flat seams on walls as well as for seams on the inside and outside corners in the various embodiments thereof.

It is a further object of this invention to provide a seam-covering strip which will make it easy for the plasterer to apply the plaster in perfect registration with the wall for minimum visibility of the finished seam.

In the invention's basic embodiment a plastic body strip is provided having tapered edges on each side approximately 3 inches in width. The rear of the plastic body strip is provided with an adhesive back for easy and quick affixation over the plasterboard's seam. Provided along the central front portion of the body strip is a central projection which may, in one embodiment, form a bead-like projection which rises above the body strip approximately 1/8 inch. Plaster is then positioned with a trowel or other tool on either side of the bead. The bead causes the trowel to operate at an angle to the plasterboard to form a perfectly feathered edge. The same body strip may have a widened central projection with a notch cut out at approximately 90 on its front face. This strip may be used on flat surfaces with the notch being filled in by the plaster. However, this embodiment can also be utilized for both inside and outside corners. The strip may be folded thereby closing the notch to form an inside corner with the remainder of the central projection forming a rise acting like the bead in the initially discussed embodiment to cause the feathering of the plaster. This strip also can be used on outside corners with the same central projection forming the feathering causing rises on either side of the point of the corner. The inner part of the 90 notch cut out is spread flat at the point of the corner a width of approximately 1/8 inch. This invention will make it much easier to form outer and inner corners without the necessity of having many different types of metallic inside and outside corner-forming members which must now be tacked in position.

An alternate embodiment of the seam-covering strip has an approximate 90 rear-notched projection which when utilized on an outside seam forms a right-angled corner while the notch is closed with the rest of the projection forming the feathering causing rise for the plaster. The rear-notched member can be utilized for an inside corner with the notch opened and although it leaves a small space between the plasterboard and the strip, the plaster will form into a feathered edge by the projections being positioned half on each side of the corner.

The seam strip of this invention can be provided in roll form in any length. It should be made of pliable plastic material but one which will not have memory of its roll form but of its linear form so that when placed on a wall, it would not have a tendency to curl. Further the outside edges should be somewhat tapered toward the plasterboard so as not to form a sharp corner that might protrude through the thin portion of the plaster being feathered thereover. It should be noted that it would be of significant advantage to individuals or professionals when plastering walls to have a material thich can be used as described herein for all inner and outer corner seams and wall seams rather than having different materials for each use.


FIG. 1 is a view of a strip of seam-covering tape of this invention in roll form.

FIG. 2 is a cross-sectional view through a section of the seam strip showing the central bead and plaster placed thereover.

FIG. 3 is an illustration of a seam strip with a front-notched projection.

FIG. 4 shows the strip of FIG. 3 mounted on an inside corner.

FIG. 5 illustrates the strip of FIG. 3 mounted on an outside corner.

FIG. 6 shows a cross-sectional view through a strip with a rear-notched central projection.

FIG. 7 shows the strip of FIG. 6 positioned on an outside corner.

FIG. 8 illustrates the strip of FIG. 6 positioned on an inside corner.


FIG. 1 illustrates roll 10 of plastic strip material 12 having an adhesive back 14 and tapered edges 16 and 18. On the front face of strip 12 is central projection 20. This central projection as seen in this embodiment is bead-like and may be approximately 1/8 inch in height. Other shapes can be utilized for this central projection if desired, the idea being to cause the trowel to be elevated at a central point causing the plaster to be automatically feathered to the plasterboard surface beyond the tapered edges of strip 12. In use it would be expected that the adhesive back would be paper covered which paper would be peeled back and removed before application.

Seen in FIG. 2 is the junction of plasterboards 22 and 24 and the affixation over the junction of strip 12 held to the plasterboard by adhesive 14. The bead-like central projection 20 is seen with plaster 26 extending from either side thereof and feathered out toward edges 28 to the plasterboards. An alternate embodiment which can be utilized not only for wall seams but also for inner and outer corner seams is seen in FIG. 3 wherein the bead-like projection 20 is widened along the length of the strip and has a front-faced notch 30 of approximately 90 cut out therefrom. This design allows the strip to be folded along the central portion 32 to accommodate either an inner or outer corner. By folding the edges backwards, one may use the strip on an outer corner as seen in FIG. 5. This utilization will create a flat surface where the notch was and an elevated portion of the central projection above the strip which will cause the plaster to be feathered when applied. The angular notch will open to form the edge of the wall and form a neat and attractive edge. If the edges of the strip are moved forward toward one another, the notch closes in on itself, and the strip may be positioned in an inside corner as seen in FIG. 4. The plaster may be applied in the same fashion with the trowel rising on the elevated edge of the central projection with the plaster extending beyond the edge of the strip automatically being feathered by the trowel at the angle created by the elevated sections of the central projection. The edges of the central projection may be tapered toward the body strip to avoid any sharp corners protruding through the plaster.

In an alternate embodiment a similar strip may have a rearnotched central projection as seen in FIG. 6. This strip will produce, when placed on an outer corner with insides of the rear 90 notch coming together, a sharp outside corner as seen in FIG. 7. The plaster may be beaded from the edge of the central projection on each side of the corner and feathered against the plasterboard beyond the strip. When this embodiment is utilized on an inside corner as seen in FIG. 8 a small space is created between it and the corner, but the plaster may still be positioned over the projections to be feathered to the plasterboard.

Various embodiments of plastic strip 12 can be provided as further illustrated in FIG. 1 in sectional views. In order to assist adhesion of the plaster to the strip, the strip can be provided with a matte or non-smooth surface. The strip can also be provided with holes 13, longitudinal grooves 15, or horizontal grooves 17 which will assist in holding the plaster to the strip. In some embodiments the plaster can run up to a projection 20 as in FIG. 5 and projection 20 would then not be plastered over but merely painted over. Further plastic strip 12 can be made of formed paper to the desired shape or of other materials suitable to accomplish the desired result.

This invention will significantly reduce the amount of time now taken to finish a wall joint. Although the present invention has been described with reference to particular embodiments, it will be apparent to those skilled in the art that variations and modifications can be substituted therefor without departing from the principles and spirit of the invention.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4042739 *Nov 3, 1976Aug 16, 1977Emal Earl AJoint tape for dry wall construction having water-initiated adhesive which once activated, attached to, and dried on a surface resists removal under remoistening conditions
US4135023 *Mar 24, 1977Jan 16, 1979Smith & Nephew Plastics Ltd.Embossed film product and adhesive coated strip formed therefrom
US4157271 *May 9, 1978Jun 5, 1979Moore Dan BDrywall joint filler
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4995426 *Oct 17, 1988Feb 26, 1991Milton HindenStock material for forming air turning vanes and air guide devices
US5086598 *Nov 17, 1989Feb 11, 1992Derrell J. WeldyWall board joint reinforcing system
US5313755 *Apr 20, 1993May 24, 1994Trim-Tex, Inc.Drywall corner-finishing accessory
US5368907 *Mar 29, 1993Nov 29, 1994Conboy; John S.Dry wall tape
US5418027 *Mar 3, 1994May 23, 1995Conboy; John S.Wall board tape having fibrous surface
US5428929 *Jul 23, 1992Jul 4, 1995Reese; JefferyCoilable flat, bendable strip for protecting finished corners
US5451377 *Sep 29, 1993Sep 19, 1995Rockwell International Corp.Composite structures and methods of manufacturing such structures
US5459969 *Apr 28, 1994Oct 24, 1995Stibolt; Paul E.Drywall corner finishing device
US5477643 *Oct 11, 1994Dec 26, 1995Trim-Tex, Inc.Panel edge-finishing accessory
US5486394 *Aug 26, 1994Jan 23, 1996E-Z Taping System, Inc.Self-release self-adhesive drywall tape
US5505032 *Jun 18, 1993Apr 9, 1996Wasserman; James J.Three way drywall corner trim
US5526624 *Mar 10, 1992Jun 18, 1996Roofer International AbMethod of laying roofing felt and means therefor
US5531050 *Aug 11, 1995Jul 2, 1996Stibolt; Paul E.Drywall corner finishing device
US5687523 *Aug 10, 1995Nov 18, 1997E-Z Taping System, Inc.Drywall tape
US5711124 *Jul 5, 1996Jan 27, 1998E-Z Taping System, Inc.Drywall tape with removable absorbent layer covering
US5752353 *Dec 2, 1996May 19, 1998Trim-Tex, Inc.Drywall-trimming article having curved surface covered with discrete fibers
US5795637 *Apr 17, 1997Aug 18, 1998Wallace Andrew WilsonFloor covering seam sealer cover
US5904016 *Mar 20, 1998May 18, 1999Trim-Tex, Inc.Drywall-trimming article having curved surface covered with discrete fibers
US5916101 *Jul 1, 1996Jun 29, 1999Stibolt; Paul E.Drywall corner finishing device
US5974746 *May 19, 1997Nov 2, 1999Mathias; Mark E.Drywall tape with attached bead for application to non right angle corners
US6148573 *Nov 12, 1998Nov 21, 2000Drywall Systems International IncNon coatable drywall finishing system
US6223486 *Jan 11, 2000May 1, 2001Beadex Manufacturing Co., Inc.Adjustable corner trim strip
US6226946Jan 22, 1998May 8, 2001E-Z Taping System, Inc.Self-adhesive drywall tape for fire wall
US6226957Apr 5, 1999May 8, 2001E-Z Taping System, Inc.Drywall joint system
US6332296Nov 9, 1998Dec 25, 2001Gerald MoscovitchCorner apparatus and method for forming corners of wallboard constructed walls
US6393773 *Mar 2, 2000May 28, 2002Lawrence M. MarksEnd cap for concrete balcony and method therefor
US6413606Mar 20, 2000Jul 2, 2002Carlos R. CalderonDrywall tape
US6539680 *Sep 28, 2001Apr 1, 2003Phillips Manufacturing Co.Paper bead and trim
US6615557 *Oct 16, 2001Sep 9, 2003Timothy D. Smythe, Jr.Break apart drywall finishing system
US6684586 *May 6, 1999Feb 3, 2004Pro Patch Systems, Inc.Drywall finishing strip
US6931799 *Mar 19, 2002Aug 23, 2005Martin WebbAnchoring profile, a frame assembly and a method for securing a pane against
US7137231 *Mar 1, 2004Nov 21, 2006Continuous Coating CorporationDrywall bead with knurled paper flaps and method of making same
US7141284 *Mar 20, 2002Nov 28, 2006Saint-Gobain Technical Fabrics Canada, Ltd.Drywall tape and joint
US7165373 *Nov 12, 2003Jan 23, 2007Structus Building Technologies, IncDrywall finishing system
US7451577Sep 19, 2006Nov 18, 2008Little Jr W FrankDemountable paneling system
US7836652 *Sep 17, 2009Nov 23, 2010Sanford Lloyd FuttermanSystem and method for sealing joints between exterior wall panels
US7854812Jul 29, 2008Dec 21, 2010Harman Jr George WilliamProcess for finishing wallboard joints
US8191331Nov 14, 2008Jun 5, 2012Little Jr W FrankDemountable paneling system
US8286401Nov 14, 2008Oct 16, 2012Little Jr W FrankDemountable paneling system
US8429864Sep 13, 2004Apr 30, 2013Jody NortonDrywall corner or a transition corner
US8511016Sep 7, 2005Aug 20, 2013Timothy D. Smythe, Jr.Boxable drywall corner bead
US8726592Feb 11, 2013May 20, 2014Jody NortonDrywall corner or a transition corner
US8910437Sep 6, 2012Dec 16, 2014Frederick J. RobertsonCornerbead structure
US9095422Jul 1, 2011Aug 4, 2015Liberman Distributing And Manufacturing Co.Method and structure for nasal dilator
US9222266Mar 27, 2004Dec 29, 2015John S. ConboyHinged metal connectors and joint constructions
US20030110721 *Jan 8, 2003Jun 19, 2003Harel Kenneth N.Method of making drywall bead with knurled paper flaps
US20030181114 *Mar 20, 2002Sep 25, 2003Saint Gobain Technical FabricsDrywall tape and joint
US20040020143 *Mar 19, 2002Feb 5, 2004Martin WebbAnchoring profile, a frame assembly and a method for securing a pane against
US20040031306 *Aug 13, 2002Feb 19, 2004Stibolt Paul E.Width conversion tool for use with a drywall corner finishing device and method of using same
US20040093816 *Nov 12, 2003May 20, 2004Smythe Timothy D.Drywall finishing system
US20040163340 *Mar 1, 2004Aug 26, 2004Harel Kenneth N.Drywall bead with knurled paper flaps and method of making same
US20040188067 *Mar 26, 2003Sep 30, 2004Chau David S.Heat pipe having an inner retaining wall for wicking components
US20050028483 *Aug 6, 2004Feb 10, 2005Smythe Timothy D.Drywall finishing system
US20050055963 *Aug 23, 2004Mar 17, 2005Smythe Timothy D.Boxable drywall corner bead
US20050252120 *May 10, 2005Nov 17, 2005Yoshino Sangyo Co., Ltd.Interior panel structure
US20060053712 *Sep 13, 2004Mar 16, 2006Jody NortonDrywall corner or a transition corner
US20060059809 *Sep 7, 2005Mar 23, 2006Smythe Timothy D JrBoxable drywall corner bead
US20060101746 *Oct 29, 2005May 18, 2006Timothy SmytheDrywall finishing system
US20060236626 *Mar 22, 2006Oct 26, 2006Timothy SmytheMulti-angle exterior drywall corner bead
US20060283115 *Aug 24, 2006Dec 21, 2006Robertson Frederick JFiberglass mesh faced cornerbead
US20070011969 *Sep 19, 2006Jan 18, 2007Little W F JrDemountable paneling system
US20070107336 *Nov 12, 2005May 17, 2007Conboy John SCorner bead having a reinforcing member
US20070122593 *Nov 12, 2005May 31, 2007Conboy John SWallboard tape
US20070151180 *Dec 1, 2006Jul 5, 2007John PaceTrim components and methods for manufacturing same
US20080092980 *Aug 23, 2006Apr 24, 2008Bryan WilsonSeam for papermachine clothing
US20090032197 *Jul 29, 2008Feb 5, 2009Harman Jr George WilliamJoint compound guide bead dispenser and process for finishing wallboard joints
US20090064621 *Nov 14, 2008Mar 12, 2009Little Jr W FrankDemountable paneling system
US20090084064 *Nov 14, 2008Apr 2, 2009Little Jr W FrankDemountable paneling system
US20090324883 *May 22, 2009Dec 31, 2009Liberman Distributing and Manufacturing Co. d/b/a Lidco ProductsExtendable self-supporting material
US20100071292 *Sep 17, 2009Mar 25, 2010Sanford Lloyd FuttermanSystem and method for sealing joints between exterior wall panels
US20110030297 *May 7, 2010Feb 10, 2011Robertson Frederick JCornerbead structure
US20110033693 *Feb 10, 2011Little Jr W FrankTape
US20130318901 *Feb 17, 2012Dec 5, 2013Siniat International SasElement Resistant to Air Transfers and Thermal and Hydric Transfers in the Field of Construction, Especially for Lightweight Walls or Lightweight Facades
USRE34547 *Nov 19, 1992Feb 15, 1994Lewis HeinWall board joint reinforcing system
WO1991007276A1 *Nov 12, 1990May 30, 1991Michael D WeldyArch corner bead
WO1995000731A1 *Jun 20, 1994Jan 5, 1995James J WassermanThree way drywall corner trim
WO1998044218A1 *Apr 2, 1998Oct 8, 1998Drywall Sys Int IncNon-coatable drywall finishing system
U.S. Classification428/131, 52/255, 428/61, 52/417, 428/192, 428/343, 428/167, 428/906, 428/174, 428/332
International ClassificationE04F13/04
Cooperative ClassificationY10T428/28, Y10T428/2457, E04F13/042, Y10T428/24628, Y10T428/24273, Y10T428/26, E04F13/04, Y10T428/24777, Y10T428/197, Y10S428/906
European ClassificationE04F13/04A, E04F13/04